1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * files/ether_addr.c -- "files" backend for nsswitch "ethers" database 23 * 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* 29 * All routines necessary to deal with the file /etc/ethers. The file 30 * contains mappings from 48 bit ethernet addresses to their corresponding 31 * hosts names. The addresses have an ascii representation of the form 32 * "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff; the 33 * bytes are always in network order. 34 */ 35 36 #include <sys/types.h> 37 #include <sys/socket.h> 38 #include <net/if.h> 39 #include <netinet/in.h> 40 #include <netinet/if_ether.h> 41 #include <nss_dbdefs.h> 42 #include "files_common.h" 43 #include <strings.h> 44 #include <ctype.h> 45 46 #define _PATH_ETHERS "/etc/ethers" 47 #define DIGIT(x) \ 48 (isdigit(x) ? (x) - '0' : islower(x) ? (x) + 10 - 'a' : (x) + 10 - 'A') 49 50 static int 51 check_host(nss_XbyY_args_t *argp, const char *line, int linelen) 52 { 53 const char *limit, *linep, *keyp; 54 linep = line; 55 limit = line + linelen; 56 57 /* skip leading spaces */ 58 while (linep < limit && isspace(*linep)) 59 linep++; 60 /* skip mac address */ 61 while (linep < limit && !isspace(*linep)) 62 linep++; 63 /* skip the delimiting spaces */ 64 while (linep < limit && isspace(*linep)) 65 linep++; 66 if (linep == limit) 67 return (0); 68 69 /* compare the host name */ 70 keyp = argp->key.name; 71 while (*keyp != '\0' && linep < limit && *keyp == *linep) { 72 keyp++; 73 linep++; 74 } 75 return (*keyp == '\0' && linep == limit); 76 } 77 78 static nss_status_t 79 getbyhost(be, a) 80 files_backend_ptr_t be; 81 void *a; 82 { 83 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a; 84 char hostname[MAXHOSTNAMELEN]; 85 nss_status_t res; 86 87 /* 88 * use the buffer passed in if result is to be returned 89 * in /etc file format 90 */ 91 if (argp->buf.result != NULL) { 92 argp->buf.buffer = hostname; 93 argp->buf.buflen = MAXHOSTNAMELEN; 94 } 95 96 res = _nss_files_XY_all(be, argp, 0, argp->key.name, check_host); 97 98 if (argp->buf.result != NULL) { 99 argp->buf.buffer = NULL; 100 argp->buf.buflen = 0; 101 } 102 103 return (res); 104 } 105 106 static int 107 check_ether(nss_XbyY_args_t *argp, const char *line, int linelen) 108 { 109 110 const char *limit, *linep; 111 uchar_t ether[6]; 112 ptrdiff_t i; 113 int n; 114 115 linep = line; 116 limit = line + linelen; 117 118 /* skip leading spaces */ 119 while (linep < limit && isspace(*linep)) 120 linep++; 121 122 for (i = 0; i < 6; i++) { 123 n = 0; 124 while (linep < limit && isxdigit(*linep)) { 125 n = 16 * n + DIGIT(*linep); 126 linep++; 127 } 128 if (*linep != ':' && i < 5) { 129 return (0); 130 } else if (*linep == ':' && i == 5) { 131 return (0); 132 } else { 133 linep++; 134 ether[i] = (uchar_t)n; 135 } 136 } 137 return (ether_cmp((void *)ether, (void *)argp->key.ether) == 0); 138 } 139 140 static nss_status_t 141 getbyether(be, a) 142 files_backend_ptr_t be; 143 void *a; 144 { 145 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a; 146 struct ether_addr etheraddr; 147 nss_status_t res; 148 149 argp->buf.result = ðeraddr; 150 151 res = _nss_files_XY_all(be, argp, 0, NULL, check_ether); 152 153 argp->buf.result = NULL; 154 return (res); 155 } 156 157 static files_backend_op_t ethers_ops[] = { 158 _nss_files_destr, 159 getbyhost, 160 getbyether 161 }; 162 163 /*ARGSUSED*/ 164 nss_backend_t * 165 _nss_files_ethers_constr(dummy1, dummy2, dummy3) 166 const char *dummy1, *dummy2, *dummy3; 167 { 168 return (_nss_files_constr(ethers_ops, 169 sizeof (ethers_ops) / sizeof (ethers_ops[0]), 170 _PATH_ETHERS, 171 NSS_LINELEN_ETHERS, 172 NULL)); 173 } 174